115results about How to "Reduce benzene content" patented technology

A process is disclosed for generating pure aromatic compounds from a reformed gasoline which contains aromatic compounds, olefins, diolefin, and triolefins, which comprises the steps of: (a) selectively hydrogenating the olefins, diolefins and triolefins in the reformed gasoline to obtain a mixture of hydrogenated, non-aromatic compounds and aromatic compounds; and (b) separating the aromatic compounds from the hydrogenated, non-aromatic compounds in the mixture formed during step (a) by either extractive distillation, liquid-liquid extraction or both to obtain the pure aromatic compounds.

The invention provides a sorbent used for reducing the content of sulfur in light hydrocarbon oil. According to weight percentage, the sorbent comprises 1-30 percent of phosphorus-modified rare earth faujasite, 5-40 percent of active metal oxide and 30-94% of carrier; wherein, the carrier comprises alumina and zinc oxide; the rare earth faujasite is modified by phosphorus and is pre-formed into porous heat-resistance solid grains together with carrier mixture; subsequently, the active metal oxide is led into the solid grains, thus preparing the sorbent; the light hydrocarbon oil raw material containing the sulfur and hydrogen donor enter a reactor filled with the sorbent; the materials are separated after reaction; the reaction products are sent to a subsequent separation system so that the product is separated; the sorbent to be regenerated after reaction is stripped, burned and regenerated; and the regenerated sorbent is reduced by the hydrogen donor and subsequently returns to the reactor so as to be circularly used. The sorbent realizes that the sulfur of light hydrocarbon oil is deeply removed, and simultaneously, the octane number of the outcome gasoline is higher, while thebenzene content is lower and the strength is higher.

The invention discloses a desulfurization adsorbent, which comprises 1 to 30 weight percent of rare earth-zeolite mixture, 5 to 40 weight percent of active metal oxide and 30 to 94 weight percent of carrier, wherein the carrier comprises alumina and zinc oxide; the rare earth-zeolite mixture and a carrier mixture are preformed into porous heat-resistant solid particles, and then active metal ingredients are introduced on the solid particles to obtain the adsorbent; and a light hydrocarbon oil raw material containing sulfur and a hydrogen donor enter a reactor filled with the adsorbent, materials remained after the reaction are separated, a reaction product is sent into a subsequent separation system for product separation, a spent adsorbent after the reaction is steam-stripped and then is subject to coke-burning regeneration, and the regenerated adsorbent is reduced by the hydrogen donor and is returned to the reactor for cyclic use. The adsorbent realizes the deep removal of sulfide in light hydrocarbon oil, and the produced gasoline has higher octane number, lower benzene content, and higher strength at the same time.

The invention provides a method used for reducing the content of sulfide in light hydrocarbon oil, which comprises the steps as follows: after being preheated, a hydrocarbon oil raw material containing sulfur, and hydrogen donor enter a reactor filled with a sorbent and a zeolite additive so as to react under the conditions as follows: temperature of 300-500 DEG C, pressure of 0.5-3.5MPa, weight hourly space velocity of raw material oil at 0.5-10h<-1> and weight ratio between total amounts of the sorbent and the hydrocarbon oil raw material at 1-20; the materials are separated after reaction; the reaction products are sent to a subsequent separation system so that the product is separated; the sorbent to be regenerated and the zeolite additive to be regenerated after reaction are stripped, burned and regenerated; and the regenerated sorbent and the zeolite additive are reduced by the hydrogen donor and subsequently returned to the reactor so as to be circularly used. The method adds the zeolite additive during the adsorption desulfurization process, realizes deep desulfurization, leads the removal rate of the sulfur to achieve more than 96wt percent when disposing the gasoline, reduces the olefin of the gasoline, improves the octane number of the outcome gasoline simultaneously, keeps high liquid recovery and has low benzene content in the outcome gasoline.

The invention discloses a desulfurization adsorbent composition, which comprises 1 to 30 weight percent of phosphorus-modified rare earth-zeolite mixture, 5 to 40 weight percent of active metal oxide and 30 to 94 weight percent of carrier, wherein the carrier comprises alumina and zinc oxide; a rare earth-zeolite mixture is modified by phosphorus and then is preformed with a carrier mixture into porous heat-resistant solid particles, and then active metal components are introduced on the solid particles to obtain an adsorbent; and a light hydrocarbon oil raw material containing sulfur and a hydrogen donor enter a reactor filled with the adsorbent, materials remained after the reaction are separated, a reaction product is sent into a subsequent separation system for product separation, a spent adsorbent after the reaction is steam-stripped and then is subject to coke-burning regeneration, and the regenerated adsorbent is reduced by the hydrogen donor and is returned to the reactor for cyclic use. The adsorbent realizes the deep removal of sulfide in light hydrocarbon oil, and the produced gasoline has higher octane number, lower benzene content, and higher strength at the same time.

A catalytic conversion method for reducing benzene content in gasoline comprises steps as follows: in a fluidized bed and/or riser reactor, allowing benzene-containing gasoline to be contacted with catalytic cracking catalyst to separate out the gasoline with reduced benzene content, wherein the catalytic cracking catalyst contains zeolite and heat resistant inorganic oxide, and the zeolite is mesoporous and/or macroporous zeolite. When the benzene-containing gasoline is treated with the method provided by the invention, the benzene content in the gasoline can be reduced by more than 60% (v/v); since benzene reacts with alcohol to be converted to gasoline fraction, the gasoline yield is increased; and since benzene reacts with alcohol to be converted to aromatic hydrocarbon, the gasoline octane number is improved.

The invention relates to a method for separating narrow cut fraction industrial grade n-hexane from a C5 to C7 light hydrocarbon mixture, as well as a packed tower and a float valve tower thereof. The method uses the C5 to C7 light hydrocarbon mixture as a raw material and adopts the simple rectification process of a two-tower separation sequence including the regular packed tower and the float valve tower, wherein the former tower is mainly used for stripping n-hexane, and the latter tower is mainly used for stripping benzene. The invention solves the three technical difficulties of narrowing the range of product fractions, reducing benzene content and increasing n-hexane yield during the production of industrial n-hexane, the content of product n-hexane is from 70 to 98 percent, the benzene content is not more than 0.1 percent, the distillation range is from 0.5 to 3 DEG C, and the yield is from 85 to 98 percent. The light components separated by the method are mixed with heavy components to obtain the product of solvent oil No.6, so that the resources of the original C5 to C7 light hydrocarbon mixture are thoroughly utilized, and thus, the economic benefits are increased.

The present invention provides a process for deep desulphurization of cracked gasoline with minimum octane loss of about 1-2 units. In this process full range cracked gasoline from FCC, Coker, Visbreaker etc is sent to Diolefin Saturation Reactor for selective saturation of diolefins. After saturation of diolefins, the stream is sent to Splitter for splitting into three cuts i.e Light Cut (IBP-70° C.), Intermediate Cut (70-90° C.) and Heavy Cut (90-210° C.). The Light Cut which contains majority of the high octane olefins and mercaptan sulfur is desulfurized with caustic treatment using Continuous Film Contactor (CFC). The sulfur in the Intermediate Cut is also predominantly mercaptans and the cut can be desulfurised by caustic treatment using CFC along with Light cut or separately desulfurised before being sent for isomerization. The Heavy Cut containing mainly thiophinic sulfur compounds is treated either by using conventional HDS process or reactive adsorption process.

The invention relates to a preparation method of an environment-friendly vegetable oil low-temperature extraction solvent. In the preparation method, with No.6 solvent oil as a main raw material, high-purity hydrogen and the like as auxiliary raw materials and methyl pentane as a main extraction ingredient, residues are reduced to a maximum extent in the process of extracting vegetable oil and desolventizing dregs under the condition of low temperature; the protein activity in the dregs is kept; the benzene content in an extracting agent and the residual solvent content in the oil and the dregs can be reduced; and the distilling range is short, and therefore the purposes of convenient desolventizing process, easy control and low trace residues can be achieved. In the whole desolventizing process, energy saving and environment-friendliness are realized, and the pollution of normal hexane to atmosphere is greatly reduced.

The invention provides a sorbent used for reducing the content of sulfide in light hydrocarbon oil. According to weight percentage, the sorbent comprises 1-30% of phosphorus-modified rare earth shape-selective zeolite, 5-40% of active metal oxide and 30-94% of carrier; wherein, the carrier comprises alumina and zinc oxide; the rare earth shape-selective zeolite is modified by phosphorus and is pre-formed into porous heat-resistance solid grains together with carrier mixture; subsequently, the active metal oxide is led into the solid grains, thus preparing the sorbent; the light hydrocarbon oil raw material containing the sulfur and hydrogen donor enter a reactor filled with the sorbent; the materials are separated after reaction; the reaction products are sent to a subsequent separation system so that the product is separated; the sorbent to be regenerated after reaction is stripped, burned and regenerated; and the regenerated sorbent is reduced by the hydrogen donor and subsequently returns to the reactor so as to be circularly used. The sorbent realizes that the sulfide of light hydrocarbon oil is deeply removed, and meanwhile, the octane number of the outcome gasoline is higher, while the benzene content is lower and the strength is higher.

A catalytic reforming process for producing gasoline of reduced benzene content includes the steps of reforming a reformer feedstock that includes a naphtha stream to produce a gasoline reformate product stream; splitting the gasoline reformate product stream into one or more relatively benzene-rich fractions and one or more relatively benzene-lean fractions; and hydrogenating the one or more relatively benzene-rich fractions to produce a cyclohexane-rich effluent, at least a portion of which cyclohexane-rich effluent is recycled to constitute a portion of the reformer feedstock.

A method for converting aromatic hydrocarbons by contacting an aromatic hydrocarbon starting material including benzene and having a non-aromatic compound content of 1% by weight or less, with a catalystto generate useful C7 and C8 aromatic hydrocarbons while reducing the catalyst deactivation.

A gasoline processing method includes: subjecting raw materials of full distillates to a fractionating tower to be fractioned into three fractions, and removing mercaptan sulfur in a light fraction by means of alkali extraction to obtain a liquid product I which is a gasoline blending component; processing an intermediate fraction through a first hydrogenation unit to obtain a liquid product II which is a qualified aromatics extraction raw material; and processing a heavy fraction through a second hydrogenation unit to obtain a liquid product III which is a gasoline blending component. By the gasoline processing method, a qualified aromatic hydrocarbon product and a qualified gasoline product can be obtained simultaneously, sources of the aromatic hydrocarbon product are widened, and compared with raw materials, the obtained gasoline product has the advantages that the induction period is greatly prolonged, sulfur content is greatly reduced, and aromatic hydrocarbon content, especially benzene content is reduced.

The invention relates to a treatment method for gas containing high-concentration benzene. The treatment method comprises the following steps: (a) carrying out absorption treatment on the gas containing the high-concentration benzene in absorption equipment by using an absorbent to form absorption liquid and absorbed gas, and recycling the absorption liquid; (b) carrying out condensation treatment on the absorbed gas by a condenser at the condensation temperature of 0 to 70DEG C to form condensed liquid and condensed gas, and recycling the condensed liquid; (c) carrying out adsorbing purification on the condensed gas by an adsorbent in an adsorber to form purified gas, and exhausting the purified gas; carrying out vacuumizing desorption on the adsorbent to form desorbed gas, and returning the desorbed gas to an inlet of the condenser or an inlet of the absorption equipment. The invention aims to achieve the aim that the concentration of the benzene in the benzene-containing gas is reduced to be 4mg/Nm<3> or lower; meanwhile, the absorption liquid and the condensed liquid can be easily treated or can be directly used for other processes. The treatment method disclosed by the invention is applied to treatment of tail gases generated by a benzene material dumper and a benzene storage tank, other high-concentration benzene-containing gases, and the like.

The present invention provides a process for producing liquid hydrocarbon products from solid biomass and/or residual waste feedstocks, said process comprising the steps of: a) hydropyrolysing the solid feedstock in a hydropyrolysis reactor vessel in the presence of molecular hydrogen and one or more deoxygenation catalyst, producing a product stream comprising partially deoxygenated hydropyrolysis product, H₂O, H₂, CO₂, CO, C₁-C₃ gases, char and catalyst fines; b) removing said char and catalyst fines from said product stream; c) hydroconverting said partially deoxygenated hydropyrolysis product in a hydroconversion reactor vessel in the presence of one or more hydroconversion catalyst and of the H₂O, CO₂, CO, H₂, and C₁-C₃ gas generated in step a), producing a vapour phase product comprising substantially fully deoxygenated hydrocarbon product, H₂O, CO, CO₂, and C₁-C₃ gases; d) condensing the vapour phase product of step d) to provide a liquid phase product comprising substantially fully deoxygenated C4+ hydrocarbon liquid and aqueous material and separating said liquid phase product from a gas phase product comprising H₂, CO, CO₂, and C₁-C₃ gases; e) removing the aqueous material from the substantially fully deoxygenated C4+ hydrocarbon liquid; and f) hydroprocessing at least a portion of the substantially fully deoxygenated C4+ hydrocarbon liquid in a hydroprocessing reactor vessel in the presence of hydrogen and one or more hydroprocessing catalysts, each hydroprocessing catalyst comprising at least one reduced metal on a solid support, in order to provide an upgraded liquid hydrocarbon stream.

The invention relates to a preparation method of an edible oil leaching agent, in particular to a preparation method of the leaching agent used in edible oil industries; and the preparation method comprises the following steps of: taking aromatic raffinate oil refined by petroleum as a raw material, and by using a fibrous membrane contactor, carrying out washing and desulfuration, dehydration, hydrogenation deolefination, hydrogenation dearomatization, distillation and the like so as to obtain the leaching agent with high quality. The preparation method has the advantages of increasing the product quality and recovery rate of a solvent, decreasing residual oil in oil residuals, reducing the solvent loss and energy consumption, being beneficial to increasing the quality of oil and oil residuals, having no influence on environments and being safe to human bodies.

The invention provides an aromatization catalyst and a preparation method, regeneration method and aromatization method thereof. The preparation method comprises mixing a zeolite molecular sieve and abinder to obtain a catalyst precursor, orderly performing ion exchange modification and first modification treatment on the catalyst precursor, and after hydrothermal treatment, carrying out active metal loading and second modification treatment to obtain the aromatization catalyst. A modification element used in the first modification is at least one selected from metals in the group IA, group VA and lanthanide line in the periodic table, the active metal is at least one element selected from elements in the group VIIB, group VIII, group IB and group IIB, and the modifying element used for the second modification is at least one element selected from elements in the group VA and lanthanide line in the periodic table. The aromatization catalyst has good carbon deposition resistance and high aromatization activity, can complete the aromatization reaction under mild conditions, and has high aromatic selectivity and a liquid yield of 98.5% or more.

The invention discloses a low-odor ultraviolet-curing woodenware paint formula. The paint comprises the following components by weight percentage: 35-50% of epoxy resin, 25-35% of aliphatic polyurethane resin, 8-12% of a monomer EO-HDDA, 8-12% of a monomer EO-TMPTA, 4-7% of a monomer HEMA, 3-6% of a photoinitiator, and 0.2-1% of an auxiliary agent. The auxiliary agent comprises a leveling agent and an antifoaming agent. The prepared paint has the advantages of good adhesive force, high heat resistance, low benzene content, low odor before and after curing is carried out, and little influence on human body.

The invention relates to a catalyst for acetylene method vinyl acetate synthesis and a preparation method thereof, and mainly aims to solve the problem of high benzene content in a vinyl acetate product in the prior art. According to the technical schemes of the invention, the catalyst for acetylene method vinyl acetate synthesis comprises an active component and a carrier; the active component iszinc acetate; the carrier is nitrogen-doped activated carbon; the content of the N element in the carrier is 2.8-10wt%; and therefore, the problem is better solved, and the method can be used for industrial production of acetylene-method vinyl acetate.

The invention relates to an absorption and adsorption treatment method of high-concentration benzene gas. The method comprises the steps of (a) carrying out absorption treatment on the high-concentration benzene gas by using efficient absorption equipment, forming absorption liquid and absorbed gas and recycling the absorption liquid; (b) carrying out condensation treatment on the absorbed gas through a condenser, wherein the condensation temperature is -40 DEG C to 5 DEG C, and forming condensate and a condensed gas after condensation treatment and recycling the condensate; and (c) adsorbing and purifying the condensed gas through activated carbon fiber adsorber, forming a purified gas for discharging, carrying out desorption treatment to form desorbed gas and forming recyclable desorbed gas condensate after condensation. The absorption and adsorption treatment method aims at solving the technical problem of how to reduce the concentration of benzene in the benzene gas to 4mg/Nm<3> or below, and meanwhile, the absorption liquid and the condensate can be separated or can be directly used for other processes. The method provided by the invention is applied to treatment of a benzene material lift truck, tail gas generated by a benzene storage tank and other high-concentration benzene gases.